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The Collaborative International Dictionary
burnup

burnup \burnup\ n. the amount of fuel used up (as in a nuclear reactor).

Wiktionary
burnup

n. (context physics English) A measure of the consumption of fuel in a nuclear reactor.

WordNet
burnup
  1. n. a high-speed motorcycle race on a public road

  2. the amount of fuel used up (as in a nuclear reactor)

Wikipedia
Burnup

In nuclear power technology, burnup (also known as fuel utilization) is a measure of how much energy is extracted from a primary nuclear fuel source. It is measured both as the fraction of fuel atoms that underwent fission in %FIMA (fissions per initial metal atom) and as the actual energy released per mass of initial fuel in gigawatt-days/ metric ton of heavy metal (GWd/tHM), or similar units.

Usage examples of "burnup".

Benjamin Evelyn Konrad, thirty-two, dancer and revue star, Flat 17, Burnup House, W.

It was impossible to access a microsat, to modulate the shielding to prevent burnup on reentry, and then guide it to earth with such pinpoint accuracy that an attacking force less than fifty meters from the Resistance fighters would be wiped out, yet leave the other group untouched.

Our burnups, misfires, explosions, fizzles, and lost or wayward vehicles are well publicized.